Alfred has to run in the background, e.g.

alfred -i br-ffm

Set up a crontab to generate the nodes.json used by the ffmap frontend, e.g.

* * * * * /opt/ffmap-backend/mkmap.sh .

To generate the more detailed nodes_load.json, also add a crontab for it, e.g.

0-59/5 * * * * alfred-json -r 159 -f json -z > /var/www/ffmap/nodes_load.json